How much has the U.S. National Debt increased over the nation’s history? July 8, 2020 by Pamela Landy In 1800, the national debt was $83 million. In 1988, it was $2.6 trillion. Related Answers How many nations first joined the United Nations? How large was the first national debt in the U.S.? Has the U.S national debt ever been fully paid off? How much did the U.S. national debt grow during World War II? How many sites did the United Nations occupy before moving to its present location? How much credit card debt does the average American owe?